package Data;

public class find1From2 {

  public static void main(String[] args) {

    int num[] = {1,5,4,1,4};

    int len = num.length;

    int res = 0;

    for(int i=0;i<len;i++){
      res = res^num[i];
    }
//    System.out.println(res);

    System.out.println(1^4);
  }


}
